Well, even more: I have a weather widget on my phone -- on the home screen, even. That makes "knowing the weather" even that much easier.
So clearly, this isn't about convenience of knowing the weather. This is about _specially highlighting_ the fact that today's weather will be PERFECT. As in, bringing attention to the fact that the day really is great.
The point is to have fun, enjoy life, and to have a beautiful day.
I built the service because I personally wanted a service like it. Perhaps others will enjoy it.